Switched on a Tandem Cypres 2 this morning and before it went to "0" a 13 flashed on the screen. It's not the date of the next service, just a plain old "13". Does anyone know what this means??? I can't find anything in the manual. Thanks for the help.

If other than these three described numbers appear in the display, or if the unit switches itself off and can not be switched on again, please contact Airtec or SSK. Please record the error code number!

Ah, that's the "in" that shows up in the small words on screen bottom " next maint. in".

If you didn't just see the screen for a split second and miss perceiving the first digits of the maintenance date, or the screen wasn't half obscured, or there's no apparent damage to the LCD screen.... then it is a bit of a mystery to me!

If you cycle the unit off and on, did it come up again?? (Obviously one would rightly hesitate to jump any AAD if an error seemed to have happened, even if the error cleared next time around.)